Intercomparison of aerosol extinction profiles retrieved from MAX-DOAS measurements
| Autor: | Steffen Beirle, Ping Xie, Marcel M. Moerman, Ang Li, H. Klein Baltink, G. de Leeuw, Reza Shaiganfar, Paul Zieger, F. Hendrick, Bas Henzing, S. Yilmaz, K. Clémer, M. Van Roozendael, Yu-Tu Wang, Thomas Wagner, Udo Frieß, Hitoshi Irie |
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| Přispěvatelé: | Department of Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Backscatter Urban Mobility & Environment Urbanisation 010501 environmental sciences Environment Atmospheric sciences 01 natural sciences 114 Physical sciences Sun photometer RELATIVE-HUMIDITY Atmospheric radiative transfer codes OPTICAL-ABSORPTION SPECTROSCOPY lcsh:TA170-171 NITROGEN-DIOXIDE 0105 earth and related environmental sciences Remote sensing MIXING RATIOS Nephelometer lcsh:TA715-787 Differential optical absorption spectroscopy IN-SITU lcsh:Earthwork. Foundations BOUNDARY-LAYER CAS - Climate Air and Sustainability Ceilometer INDEPENDENT DATA SETS LIGHT-SCATTERING Aerosol lcsh:Environmental engineering 13. Climate action Measuring instrument Environmental science ELSS - Earth Life and Social Sciences BEIJING AREA Environment & Sustainability RADIATIVE-TRANSFER MODEL |
| Zdroj: | Atmospheric Measurement Techniques, 7, 9, 3205-3222 Atmospheric Measurement Techniques Atmospheric Measurement Techniques, Vol 9, Iss 7, Pp 3205-3222 (2016) |
| ISSN: | 1867-8548 |
| Popis: | A first direct intercomparison of aerosol vertical profiles from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations, performed during the Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI) in summer 2009, is presented. Five out of 14 participants of the CINDI campaign reported aerosol extinction profiles and aerosol optical thickness (AOT) as deduced from observations of differential slant column densities of the oxygen collision complex (O4) at different elevation angles. Aerosol extinction vertical profiles and AOT are compared to backscatter profiles from a ceilometer instrument and to sun photometer measurements, respectively. Furthermore, the near-surface aerosol extinction coefficient is compared to in situ measurements of a humidity-controlled nephelometer and dry aerosol absorption measurements. The participants of this intercomparison exercise use different approaches for the retrieval of aerosol information, including the retrieval of the full vertical profile using optimal estimation and a parametrised approach with a prescribed profile shape. Despite these large conceptual differences, and also differences in the wavelength of the observed O4 absorption band, good agreement in terms of the vertical structure of aerosols within the boundary layer is achieved between the aerosol extinction profiles retrieved by the different groups and the backscatter profiles observed by the ceilometer instrument. AOTs from MAX-DOAS and sun photometer show a good correlation (R>0.8), but all participants systematically underestimate the AOT. Substantial differences between the near-surface aerosol extinction from MAX-DOAS and from the humidified nephelometer remain largely unresolved. |
| Databáze: | OpenAIRE |
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